Quantifying the combined effects of the heating time, the temperature and the recovery medium pH on the regrowth lag time of Bacillus cereus spores after a heat treatment

Abstract : The purpose of this study was to quantify the lag time of re-growth of heated spores of Bacillus cereus as a function of the conditions of the heat treatment: temperature, duration and pH of the recovery medium. For a given heating temperature, curves plotting lag times versus time of heating show more or less complex patterns. However, under a heating time corresponding to a decrease of 2 decimal logarithms of the surviving populations of spores, a linear relationship between the lag time of growth and the time of the previous heat treatment can be observed. The slope of this linear relationship followed itself a Bigelow type linear relationship, the slope of which yielded a - value very close to the observed conventional z-value. It was then concluded that the slope of the regrowth lag time versus the heating time followed a linear relationship with the sterilisation value reached in the course of the previous heat treatment. A sharp effect of the pH of the medium which could be described by a simple "secondary" model was observed. As expected, the observed intercept of the linear relationship between lag time and heating time (lag without previous heating) was dependent on only the pH of the medium and not on the heating temperature.
Type de document :
Article dans une revue
International Journal of Food Microbiology, Elsevier, 2005, pp.1-6
Liste complète des métadonnées

Littérature citée [19 références]  Voir  Masquer  Télécharger

http://hal.univ-brest.fr/hal-00653930
Contributeur : Marielle Le Guen <>
Soumis le : mardi 20 décembre 2011 - 16:22:15
Dernière modification le : jeudi 13 septembre 2018 - 14:56:02
Document(s) archivé(s) le : mercredi 21 mars 2012 - 02:50:12

Fichiers

Gaillard_et_al_2005_IJFM_Vol10...
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-00653930, version 1

Citation

Stéphane Gaillard, Ivan Leguérinel, Nicolas Savy, Pierre Mafart. Quantifying the combined effects of the heating time, the temperature and the recovery medium pH on the regrowth lag time of Bacillus cereus spores after a heat treatment. International Journal of Food Microbiology, Elsevier, 2005, pp.1-6. 〈hal-00653930〉

Partager

Métriques

Consultations de la notice

429

Téléchargements de fichiers

722